462 P. K downing — Quantitative separation of 



Series III gives the result of a double treatment. In this 

 series the contaminating effect of the strontium salt disappears 

 almost entirely leaving a deficiency of about 0'0025 grm. on 

 the oxide to be added to the barium, and a corresponding 

 amount of sulphate (0-0040 grm.) to be subtracted from the 

 strontium sulphate before calculating it to the condition of 

 the oxide. The manipulation is the same as that outlined for 

 the single treatment, as far as the completion of the first boil- 

 ing. At this point the amyl alcohol containing most of the 

 strontium in solution was decanted upon a weighed and ignited 

 felt and collected in a beaker placed to receive it. The residue 

 of barium with traces of strontium was then dissolved in a 

 few drops of water, a drop of hydrobromic acid was added 

 and the boiling was repeated with another portion of 10 cm 8 

 of amjl alcohol. Upon reaching the boiling point of the 

 alcohol the beaker was removed, and the barium salt was fil- 

 tered upon the felt through which the first portion had been 

 decanted, and treated as before described. 









Series 



III. 











"BaO found. 







SrO found. 







BaO taken. 



(Corrected.) 



Error. 



SrO taken. 



(Corrected.) 



Error. 





grm. 



grm. 



grm. 



grm. 



grm. 



grm. 



(1) 



0-1212 



0-1219 



0-0007 + 



0-1068 



0-1071 



0*0003 + 



(2) 



0-1215 



0-1219 



0-0004 + 



0-0358 



0-0359 



0-0001 + 



(3) 



0-1220 



0-1221 



0-0001 + 



0-0353 



0-0347 



0-0006 — 



(4) 



0-1212 



0-1220 



0-0008 + 



0-0363 



0-0358 



0-0005 — 



(5) 



0-1219 



0-1221 



0-0002 + 



0-0361 



0-0354 



0-0007 — 



(6) 



0-1211 



0-1218 



0'0007 + 



0-1126 



0-1116 



o-ooio— 



(<) 



0-1319 



0-1319 



o-oooo 



0-0577 



0-0586 



0-0009 + 



(8) 



0-0496 



0-0492 



0-0004 — 



0-0574 



0-0579 



0-0005 + 



The method is rapid, and while the correction to be applied 

 owing to the solubility of the barium salt is large it is so 

 definite that it cannot be objectionable. The author in conclu- 

 sion would express his indebtedness to Prof. F. A. Gooch of 

 the Kent Laboratory for the many helpful suggestions re- 

 ceived from him bearing upon this investigation. 



Aet. LXII. — A Note on the method for the Quantitative 

 Separation of Strontium from Calcium oy the action of 

 Amyl A Icohol on the Nitrates ; by Philip E. Browning. 



[Contributions from the Kent Chemical Laboratory of Yale College — XX.] 



Recent work on my method for the quantitative separation 

 of strontium from calcium by the action of amyl alcohol on 



